Machocho, Alex K.Kiprono, P.C.Grinberg, S.Bittner, S.2013-10-112013-10-112003Phytochemistry 62 (4), 573-577.http://ir-library.ku.ac.ke/handle/123456789/7453Five oleanane-type pentacyclic triterpenoids were isolated by chromatographic separation of a chloroform extract of the stem bark of Embelia schimperi. Three of these compounds have a methyleneoxy bridge. Two compounds, embelinone and schimperinone, are reported here for the first time from a natural source (they have been synthesized previously during chemical transformations). Their structures were determined by spectroscopic techniques, among which 2-D NMR was useful for complete characterization. Three of the triterpenoids exhibited mild antibacterial properties against the gram-positive bacterial strain Rhodococcus sp.enEmbelia schimperiMyrsinaceaePentacyclic triterpenoidsEmbelinoneSchimperinoneAegicerinProtoprimulagenin APrimulagenin AAntibacterial activityArticle